dictionary_to_vector.py

def dictionary_to_vector(parameters):
    """
    Roll all our parameters dictionary into a single vector satisfying our specific required shape.
    """
    keys = []
    count = 0
    params = []
    num_params = len(parameters)//2
    for l in range(1,num_params+1):
        params = params + ["W"+str(l)]
        params = params + ["b"+str(l)]
        
    for key in params:
        
        # flatten parameter
        new_vector = np.reshape(parameters[key], (-1,1))
        keys = keys + [key]*new_vector.shape[0]
        
        if count == 0:
            theta = new_vector
        else:
            theta = np.concatenate((theta, new_vector), axis=0)
        count = count + 1

    return theta, keys